Variation Characteristics of Aerosol Optical Properties During and After the Heating Period over Lanzhou City

Abstract

Abstract:

According to the observation data of aerosol scattering coefficient and aerosol optical depth ( AOD) during and after the heating period over Lanzhou and combined with the routine monitoring data of the environmental quality，this paper made a comparative analysis about the variation features of aerosol and its relationship with air pollution． The results show that the total scattering coefficient and the backscattering coefficient have three peaks during heating period，while two peaks appeared during the non － heating period． The ratio of the maximum and minimum value of the total scattering coefficient during heating and non － heating period is 1． 66 and 3．51respectively，and the aerosol optical depth during heating period was bigger than that during the non － heating period． The correlation coefficient between AOD and the total scattering coefficient is 0． 483． The daily variation of the hemispheric backscattering fraction changes in different seasons． There was a good correlation among AOD，Air Pollution Index( API) and PM10 in most cases． AOD and PM10 concentration during heating period were higher than that in non － heating period． However，during heating period AOD presented a higher value and PM10 concentration was lower value，but during non － heating period，they were very close．

Key words: urban aerosol, heating period, non － heating period, optical property, air pollution

摘要：

利用兰州市2003 ～ 2004 年采暖期前后，大气气溶胶散射系数和光学厚度( AOD) 观测资料，结合同期的环境质量常规监测资料，分析了该地区大气气溶胶性质变化特征及其与空气污染的关系。结果表明: 兰州市总散射系数和后向散射系数采暖期具有明显的3 峰变化，非采暖期呈双峰变化。采暖期和非采暖期绿光通道总散射系数最大值与最小值之比分别为1． 66 和3． 51; 采暖期光学厚度远大于非采暖期，光学厚度和总散射系数具有较好的相关性，相关系数为0． 483; 气溶胶的后向散射比日间变化随季节不同而改变; AOD 与空气污染指数( API) 、可吸入颗粒物( PM10) 的变化在大多数情况下具有很好的相关性，AOD 与PM10变化趋势基本相同，但其浓度值采暖期要高于非采暖期，而且两者之间的比值采暖期要大于非采暖期。

关键词: 城市气溶胶, 采暖期, 非采暖期, 光学特性, 空气污染

CLC Number:

张婕，刘海文，肖国杰，冯婉. 采暖期前后兰州城市气溶胶光学特性变化特征[J]. 干旱气象, 2012, 30(2): 178-181.

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